1 files changed, 222 insertions, 0 deletions
diff --git a/nixos/modules/installer/tools/nixos-rebuild.sh b/nixos/modules/installer/tools/nixos-rebuild.sh
new file mode 100644
index 00000000000..8734cb273d4
--- /dev/null
+++ b/nixos/modules/installer/tools/nixos-rebuild.sh
@@ -0,0 +1,222 @@
+#! @shell@ -e
+
+showSyntax() {
+    # !!! more or less cut&paste from
+    # system/switch-to-configuration.sh (which we call, of course).
+    cat <<EOF
+Usage: $0 [OPTIONS...] OPERATION
+
+The operation is one of the following:
+
+  switch:   make the configuration the boot default and activate now
+  boot:     make the configuration the boot default
+  test:     activate the configuration, but don't make it the boot default
+  build:    build the configuration, but don't make it the default or
+            activate it
+  build-vm: build a virtual machine containing the configuration
+            (useful for testing)
+  build-vm-with-bootloader:
+            like build-vm, but include a boot loader in the VM
+  dry-run:  just show what store paths would be built/downloaded
+
+Options:
+
+  --upgrade              fetch the latest version of NixOS before rebuilding
+  --install-grub         (re-)install the Grub bootloader
+  --no-build-nix         don't build the latest Nix from Nixpkgs before
+                           building NixOS
+  --rollback             restore the previous NixOS configuration (only
+                           with switch, boot, test, build)
+  --profile-name / -p    install in the specified system profile
+  --fast                 same as --no-build-nix --show-trace
+
+Various nix-build options are also accepted, in particular:
+
+  --show-trace           show a detailed stack trace for evaluation errors
+
+Environment variables affecting nixos-rebuild:
+
+  \$NIX_PATH              Nix expression search path
+  \$NIXOS_CONFIG          path to the NixOS system configuration specification
+EOF
+    exit 1
+}
+
+
+# Parse the command line.
+extraBuildFlags=()
+action=
+buildNix=1
+rollback=
+upgrade=
+repair=
+profile=/nix/var/nix/profiles/system
+
+while [ "$#" -gt 0 ]; do
+    i="$1"; shift 1
+    case "$i" in
+      --help)
+        showSyntax
+        ;;
+      switch|boot|test|build|dry-run|build-vm|build-vm-with-bootloader)
+        action="$i"
+        ;;
+      --install-grub)
+        export NIXOS_INSTALL_GRUB=1
+        ;;
+      --no-build-nix)
+        buildNix=
+        ;;
+      --rollback)
+        rollback=1
+        ;;
+      --upgrade)
+        upgrade=1
+        ;;
+      --repair)
+        repair=1
+        extraBuildFlags+=("$i")
+        ;;
+      --show-trace|--no-build-hook|--keep-failed|-K|--keep-going|-k|--verbose|-v|-vv|-vvv|-vvvv|-vvvvv|--fallback|--repair)
+        extraBuildFlags+=("$i")
+        ;;
+      --max-jobs|-j|--cores|-I)
+        j="$1"; shift 1
+        extraBuildFlags+=("$i" "$j")
+        ;;
+      --option)
+        j="$1"; shift 1
+        k="$1"; shift 1
+        extraBuildFlags+=("$i" "$j" "$k")
+        ;;
+      --fast)
+        buildNix=
+        extraBuildFlags+=(--show-trace)
+        ;;
+      --profile-name|-p)
+        if [ -z "$1" ]; then
+            echo "$0: ‘--profile-name’ requires an argument"
+            exit 1
+        fi
+        if [ "$1" != system ]; then
+            profile="/nix/var/nix/profiles/system-profiles/$1"
+            mkdir -p -m 0755 "$(dirname "$profile")"
+        fi
+        shift 1
+        ;;
+      *)
+        echo "$0: unknown option \`$i'"
+        exit 1
+        ;;
+    esac
+done
+
+if [ -z "$action" ]; then showSyntax; fi
+
+if [ -n "$rollback" ]; then
+    buildNix=
+fi
+
+
+tmpDir=$(mktemp -t -d nixos-rebuild.XXXXXX)
+trap 'rm -rf "$tmpDir"' EXIT
+
+
+# If the Nix daemon is running, then use it.  This allows us to use
+# the latest Nix from Nixpkgs (below) for expression evaluation, while
+# still using the old Nix (via the daemon) for actual store access.
+# This matters if the new Nix in Nixpkgs has a schema change.  It
+# would upgrade the schema, which should only happen once we actually
+# switch to the new configuration.
+# If --repair is given, don't try to use the Nix daemon, because the
+# flag can only be used directly.
+if [ -z "$repair" ] && systemctl show nix-daemon.socket nix-daemon.service | grep -q ActiveState=active; then
+    export NIX_REMOTE=${NIX_REMOTE:-daemon}
+fi
+
+
+# If ‘--upgrade’ is given, run ‘nix-channel --update nixos’.
+if [ -n "$upgrade" ]; then
+    nix-channel --update nixos
+fi
+
+
+# First build Nix, since NixOS may require a newer version than the
+# current one.  Of course, the same goes for Nixpkgs, but Nixpkgs is
+# more conservative.
+if [ "$action" != dry-run -a -n "$buildNix" ]; then
+    echo "building Nix..." >&2
+    if ! nix-build '<nixos>' -A config.environment.nix -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
+        if ! nix-build '<nixos>' -A nixFallback -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
+            nix-build '<nixpkgs>' -A nixUnstable -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null
+        fi
+    fi
+    PATH=$tmpDir/nix/bin:$PATH
+fi
+
+
+# Update the version suffix if we're building from Git (so that
+# nixos-version shows something useful).
+if nixos=$(nix-instantiate --find-file nixos "${extraBuildFlags[@]}"); then
+    suffix=$(@shell@ $nixos/modules/installer/tools/get-version-suffix "${extraBuildFlags[@]}")
+    if [ -n "$suffix" ]; then
+        echo -n "$suffix" > "$nixos/.version-suffix" || true
+    fi
+fi
+
+
+if [ "$action" = dry-run ]; then
+    extraBuildFlags+=(--dry-run)
+fi
+
+
+# Either upgrade the configuration in the system profile (for "switch"
+# or "boot"), or just build it and create a symlink "result" in the
+# current directory (for "build" and "test").
+if [ -z "$rollback" ]; then
+    echo "building the system configuration..." >&2
+    if [ "$action" = switch -o "$action" = boot ]; then
+        nix-env "${extraBuildFlags[@]}" -p "$profile" -f '<nixos>' --set -A system
+        pathToConfig="$profile"
+    elif [ "$action" = test -o "$action" = build -o "$action" = dry-run ]; then
+        nix-build '<nixos>' -A system -K -k "${extraBuildFlags[@]}" > /dev/null
+        pathToConfig=./result
+    elif [ "$action" = build-vm ]; then
+        nix-build '<nixos>' -A vm -K -k "${extraBuildFlags[@]}" > /dev/null
+        pathToConfig=./result
+    elif [ "$action" = build-vm-with-bootloader ]; then
+        nix-build '<nixos>' -A vmWithBootLoader -K -k "${extraBuildFlags[@]}" > /dev/null
+        pathToConfig=./result
+    else
+        showSyntax
+    fi
+else # [ -n "$rollback" ]
+    if [ "$action" = switch -o "$action" = boot ]; then
+        nix-env --rollback -p "$profile"
+        pathToConfig="$profile"
+    elif [ "$action" = test -o "$action" = build ]; then
+        systemNumber=$(
+            nix-env -p "$profile" --list-generations |
+            sed -n '/current/ {g; p;}; s/ *\([0-9]*\).*/\1/; h'
+        )
+        ln -sT "$profile"-${systemNumber}-link ./result
+        pathToConfig=./result
+    else
+        showSyntax
+    fi
+fi
+
+
+# If we're not just building, then make the new configuration the boot
+# default and/or activate it now.
+if [ "$action" = switch -o "$action" = boot -o "$action" = test ]; then
+    $pathToConfig/bin/switch-to-configuration "$action"
+fi
+
+
+if [ "$action" = build-vm ]; then
+    cat >&2 <<EOF
+
+Done.  The virtual machine can be started by running $(echo $pathToConfig/bin/run-*-vm).
+EOF
+fi